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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2c9cff7b5197bc880450269ed3d2d1f193552bb9f1b2fecc17ccb26aa5c5b7' 
  AND token = 'SAfh0GDvCs97k6szbokWkwZGVvKy2D29u04L6Md0r30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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