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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda0bb86daf3e2cb12b36692e506871347c6543308790596f65c8e8a91d3d593' 
  AND token = '/GZJp/sm+CYgd3GZ2nWAd9kCOE22bZ5QNhYmcMyCbSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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