Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8f0af05b80783f06ca5c4dd1725d04513590b0476d565759166e83e356f311' 
  AND token = 'MuYgo4Q4nYmeJjhtsgA0UeFKP0MzXgMyJ/HQJfkaed4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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