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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947ff00ebf8ca426714a602f9a7e2c2255d6e34a1786e9d835b5f2cdb67a6e38' 
  AND token = '3w+DsgcsYno5N0XOfAgZYKhfKMZEtbWKWAMiad5gH8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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