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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a84e10ca4a21d7544a3b0dcb5402100483b8b2b33e7e65f3c4fcd41a4a8cc00' 
  AND token = 'gS1sjmt6CC8dY+sKrBguiHdFbP5dk6N/HlITCNNzRbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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