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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557f14ddc723b7ab04cd117b0c54136f150a663c6da7da3b2bf24e9a6ed5a369' 
  AND token = 'f3fUSJt8kg5r91rhyAGvPiG/HohvbRYyG5gYou4aR/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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