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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db8c5b0a6cc408dfe1f49036485b3b9a225608900f244067c4b728cb85e5ec7' 
  AND token = 'mqFEOj+ZoEGYIFz7N9/HAa6JizWs+6qBRkE2BMF1mAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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