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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0496f9d5bcc53d2b6b8d93821c389aa2c1bf0cf304d87dbf4b6f38d2ae64f1' 
  AND token = '7Tdx7qHrdD+o0/VGu7w9MzVzai4eeHUwzoYHT8PqmZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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