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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc0e835ae9c9471bdcb5727739cb26f9070846b057d0b2af6514db4b2bfaa71' 
  AND token = 'nXVJaE7q9aNKHbkj5GNa6ktkoDz1H398CibduM1HQWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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