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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de86b6585f28253a6279ec939b31f8dfdcc1a5c4ed002130577b81ddafaa833c' 
  AND token = '07Sj5PD4TBx5EROXGWils5gxUMFKycipDp9yMFOkO8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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