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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22983f7c8d72c907a85dfdbbc2fa90652485a6fe56296ffd3cd3ed05fe81b9eb' 
  AND token = 'bCsWqCQa6Nyvd2i5wvyMsZ2a/ph8VzkqiXLih5q9IaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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