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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbcc88fabdfbcc3ddcd4662f0cd26bd84d9159cff7b2bce8de682a4b8f2e608' 
  AND token = 'aQQoh5yov8tRIb4osk84t89MJjwjVvMpy7v9VZiVc/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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