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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc024219777352ebb20374a4a5b78e9857db6d93114f1b3c610ee684b5a2c8f4' 
  AND token = 'R2UYOHY8Myos/BfqHbhknR9rmbd1E9KpGCXGHavKdec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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