Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f2e6ebcbaada0972f2ee414fd79619ad1aac7a376792a676deede2a134ec78' 
  AND token = '60sC+YwEIDo7+N2CEd+zeujBvPsapbdZPDpUCIQkZrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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