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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224df6d8e25b3d4eb50590f1f7d1e154e0876ad581a277991ff8cd22a3c807c9' 
  AND token = 'QO9D8igy8f8Kp38/9fj20+xFITMHh//UyzWhNsMKZrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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