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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cea87692e628e4e932fad29ab8b36e772e68af17a83b900b3064991ed286166' 
  AND token = 'BGcVPIe+xTMl50p3m8FlFaBYq+vpSoenv68S3MjMp+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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