SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25431596311d30c786427a405bc4e83ddd0c9b5964b2d4e69d5426b465fdaf1b' 
  AND token = '8yIHRhy/Vnge9usVnVmQucAqr3YEpnJ+Fq7ZLL5G6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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