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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c521a1d91bbf9ff9bc150de5c8afc2feab8e04cbee97616598bd373e17d8d30f' 
  AND token = 'kehNx6ESzdXZOWZ5h/G26mpg4Bcruu1UMWyQxCKixr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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