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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d810514aaecaf0bed2d4a1ff2219a56dd0f2d1b4438544839c6ffcd5fa54978' 
  AND token = 'TDwDGIxzfMGChUxsS5CzUlW3wQQpi+2DPySBNqNgX6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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