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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7878480b7b8ccb29516bbfcbe8d56ba7d798da12aefc96c353e9a8eb8acf5db' 
  AND token = 'UwY08BO81X22eAXF5xaTzuazRJY0D1yw4f8ChAvikXY=' 
  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"
    }
  }
}