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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043f39ae60e6a9ab0e31a275b4ca0d37e73485fb95e8dace824c9df70baf4b87' 
  AND token = '0sEz6LogzVt6d60B12/TdpScKjYvWImLfEtlg5Cah5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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