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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012b7ad2cef37fc0ab50128fc70fb2e1d7e420251598ff4aa311eb3530214ffb' 
  AND token = 'JNP68riNqZzzzaLi6tWAaw0AENfbT1vpD1/KshFbmIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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