SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1001d6c34a134b7f997d65ca2cdc23a0312f2852125a2b14edb889c70f3bbb9' 
  AND token = 'ZgCNqf8Uzmktjy5RGWY6xn9w88mgHNXVwnwIkzvsWY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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