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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3965dacf60688d3386b6ca769e7821c4cdf31cd5d94473aceb8c93f77e7e6227' 
  AND token = 'TmVvVKmRGP4ExFm667evv/vzw3BdQ7ATP6VuqwQ8dlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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