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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8f25819160aa9af1ea3c37dd90359c0ab6b1f4b9d8c182f481173f84f211c4' 
  AND token = 'h4djAyUcg/P8rCSXLU2pSvZbqqIyYICocYbMXfh97LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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