Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b2e1dc1990c0c6368702913bd8c2296ca6ceed917c104530f565ac69ad9c9e' 
  AND token = 'uJ992JQBkPIO91oOmK5qrWWNYE7If6zbBEMt4ngHpQ4=' 
  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"
    }
  }
}