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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39342b180dd75297538397276773a0e30b643828fde503d7a3500d38fff96519' 
  AND token = '8hctQsJEe+lA5Ljed6Gg/7xY1VSJLpPdC6LxWZ27iYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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