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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afe895b65bfa5e2f50077f2d5514c226b295d5ea57aa23cf9ebb3eb517317de' 
  AND token = 'JlGkeQ2wcnNatWRdmKl3vvk5zQs+sV43SA5cS8ZMYkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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