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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf8c3b06af2e58ced3df10cbd4ce807ed58c93e3f5be2320a62b57577f812fe' 
  AND token = 'wE/GFuMgRJ5tWM7LXZOjEKDOra2VW1w/fq3tqJ+BLZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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