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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcbd066b4de645f6d969626d07c953b3c894b75124ff5991e1a11d356eae587' 
  AND token = 'Z1isVY8l3uCgx0No85Ve4Zb9QI1Mm7by2E8o9ZgtZBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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