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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f05eec65f2d3678039c110db24e7723f592b362280d6dd2148ba0d2b1ad298b' 
  AND token = 'uBj6EGAqfLT/1L1NDf6A5AgD8maY3RTHIiE43rKco0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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