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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a832bc8784cefb4ef23df077613dcdb9bdff5ea5239ac5b1751caa1ea04bb351' 
  AND token = 'NoEyL63lLSJBM6lT/g9lumZ5BxMUiwsTOfn6akGyWnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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