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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07ad87bf50b62e280ceb2efb65526cc7dcdaa0a5b2f5bb287163e49189b351d' 
  AND token = '2cumgYLOrDDUW7OK+A9isomy+ApoBvG1zSmoiuzdW/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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