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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409b79ae70d2f0945df39c099b52bcfab4ddd617894bf614f7905f5824b6a203' 
  AND token = 'AHgP9cCf0jTqheuf5muc3TM7/wtgT8dZSNWOWUwCAk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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