SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa70c45890b6d6babe99d9a9f432ec6a748bea6cb66f428bf19b20456f59c8f' 
  AND token = 'UyQL6NQOPh0ZLc6oss9Ve3H4+Bpp+KSPKYwJKvW7Lg4=' 
  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"
    }
  }
}