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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2527f862a5dd0ed5d9a725208312f5a49bfb7da208317505ae1ef0c0ca959e' 
  AND token = 'FMd2G4RsfqZfQtIIpfJzIgMgKWf4b5cno6LoCT90N4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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