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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3161fa05a8d6b5743b44f55960c48dd5be46bbbf16f71bc10c6cba531942ff6' 
  AND token = 'YfHb33Oh+3nsgQCVfY3L6SXOr5PgU+TxDHycFpmlZ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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