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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd283bb1695c0c8d0a9d66fcc5561f251a2a6cd85890f34a9ce39ae51699ce18b' 
  AND token = 'qKLbIsLjSON3USRS3i7+GQhvlFdwVxrOr5fqVLjzLHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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