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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332deea0763f3fc9692f02bac84c9ba2ae59ca3c9939cc92694aaba5dcc3eb80' 
  AND token = 'LTw+tKO1JLupWhOAlOz9Cinr4loENeuzZoU5oRHlVhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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