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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04bb6845a997b4e9360ffb78a352cf633048e18006f8da7cdc83d6451bc422e' 
  AND token = 'gWWP2IPSQupqS6cA2r7gI2PeajmCO/WmlrGQHN32bcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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