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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35626c53a1a8730b2db9b8c011ae3eb1112274a34c443d65effcf3d897f7b143' 
  AND token = 'qsKFZNFrCUvbA/kCqyx6rb/ocshjDnxl/oWvewaBToY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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