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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4783dd27538d38f8914438e082a21409b06a84882329fa8c9814af64147e1019' 
  AND token = '7IWxnc2mESz7Ym6To8Tue0RUwswKaMWO/a3/BqdPwXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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