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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4904050a7c6b13e7629b68f20db331606b41547848adf49e5ff2d5c0bc779be0' 
  AND token = 'qnsfam2c5heGpEEx3gYf4yDfrlavK5vfHnryP4wzWS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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