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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a0f2a8d4b201d914d6df0a19f3b41537516fdf99006a06cbf6ddb6b4dd1584' 
  AND token = 'J8RQq5bQr7z5pX/QQ+klPN7o3MDehFYBAjrKPDbxB+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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