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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79ce1ece877cc2795f1f52855a0415944af9e8f830e1641ce7033eebbddea57' 
  AND token = '3RnlFVEDOJn+J3MqR383c4DDdnZPlygfN0yY9rOJbTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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