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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2ddb3343b6a8f1a4bb3dfb1fa2901e38d98acab77cc9ddd3a356bedd769eac' 
  AND token = 'GMeM20yq5gOP6S3UEqp2xbiu3sXlSGkMaQJCjG1PE/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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