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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b781badd50a0b7082b900ea0e60acc66715becabc1215d004ce3090dbdf06c39' 
  AND token = 'XsED5cI56JcKoIhdqGrt9z0qAFH9ftbmEB601ZCTw2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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