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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ede856139b3de75e4c5623e408323bfa4e779051182c32db4c4c6eec2d7f4b' 
  AND token = 'VR9Z04exwJW+4W0fnycwJe2emvS0Zg1vWHNxnzbIM9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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