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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402ff2bc7a630eff80df3bf3d31e4eb82b6037428388225c69045251818c96ac' 
  AND token = 'sNlQykCKM4WpFhDVXv8etajv+L0eOX5kg47GDAlfjww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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