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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e392636c03d15cae72f3743a77408320dbd25b851aca7a04b6d226550f1f10a' 
  AND token = 'tEp59xznCkp54DI1VqZ7BeWCpZBl9+wSvnUAzColzTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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