SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdc362c568322a6d3be3a795f46887a57e36914a09b49ea437a584f23ec9087' 
  AND token = '4s3GWHjbLJHlzDsDWwYb7LBLgVpUWX5vNbayXx/7No0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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