Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e064d46597ef0af83fb122d603f20ba789ed85291887d72e8942aecdf849809c' 
  AND token = 'W81dDxTD0NknbErw9R+vy8NXHXcwiG38SIEjJ/ax5po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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