Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca0f83040fbec2d09e3e11d8003d71c40eca4a1bbc030746285f364a0034f5e' 
  AND token = 'QtJXL10Q50rlAaJX3rjxx561YW9zeEOq+zhev5mVJGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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