SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2383abd932fb1b58f65a30ed2a7426ffd0625fc09f1aeb941470789b3de7318d' 
  AND token = 'CQxCSTMNhvN4M4/7o3HGp/+Useg+1EHp51PphrJ6XKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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