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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1505e9ad60c239fa63768b3018ed6ebeb449a9ebc634e5a22d3c31b8a101b6c9' 
  AND token = 'dNPsdLuutqS4TiJnopCHX7uP5d8rX9ICpGeLEL/OdI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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