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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60bbc8b6bdf42d60d526a1f1393b45115d07f3136570df222f41cb5a0096e56' 
  AND token = 'bhmhtQvJpD0m0qOFx01K0k/cYCeYCVt5nV3EyzSjl9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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