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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b45f6916222bafe0157f0c79dc7d820ae376b22251290e8aeaf7a1291b64895' 
  AND token = '8AKlE7GmBJHsc29tlkDbrsK/ffA9g5qTwKA8COIqA58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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