Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a89a928d25ba658f6fe463486b34a2db846c79663762ac0e50e5b4dfa1a755' 
  AND token = 'dfSCIT1b9Qeows9RMbfUxhVAoWKzJJnSVav5ia+OOnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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