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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69aae919dd82bd09cfb02f993d45ab34562d045d5ca94d87a327f3e1a033309' 
  AND token = 'leCe/x0WpbDFDHN9gqzzaWgMxJFzWWFlM3aSfsaSe8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}