Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9917b766700941fe5afe35614113aad134d515a9024a7ee5812b364f6d98f283' 
  AND token = '0Oka2FzqVb46WntKN4j95+Z+67zQdDEqdliKvT+97uE=' 
  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"
    }
  }
}