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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7172cd535ed8e1808e23a549c61ac20056e1beddbc2de7dcdee9afc14a6b6bed' 
  AND token = 'gCPIbvkNbK/Zh4EwDvWq3lm7sem69fk097bIzjEP8dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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